On Wed, 7 Dec 2016, Marc Girondot via R-help wrote:
Hi,
From the documentation of ?options
Options set in package parallel
These will be set when package parallel (or its namespace) is loaded if not
already set.
mc.cores:
a integer giving the maximum allowed number of additional R processes allowed
to be run in parallel to the current R process. Defaults to the setting of
the environment variable MC_CORES if set. Most applications which use this
assume a limit of 2 if it is unset.
As advertised.
- Start R with no MC_CORES specified:
- check environment var
- set environment var
- check options
- THEN load parallel
- check option again
Sys.getenv("MC_CORES")
[1] ""
Sys.setenv("MC_CORES"=3L)
options("mc.cores")
$mc.cores
NULL
library(parallel)
options("mc.cores")
$mc.cores
[1] 3
---
I think you confused things by loading parallel *before* setting the
environment var.
HTH,
Chuck
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